It appears another "gigaleak" has gone down, involving Nintendo. According to sources online, it appears that Game Freak has been hacked, resulting in internal data from the company being leaked to the public. Those involved in the hacking community or those within general Pokemon related groups...
This is what made it in, but there are more of those myths that do get pretty dark for this series that was uncovered in that hack, also a beta build of BW.
We were once Pokemon?
We… Could have been the ones in pokeballs?
We could have… Mated with them?
Vaporeon
Batman…I caught a pokemon Batman…
Don’t worry, rule34 has covered that very thoroughly. Both of your questions actually.
Just look at Palworld
Jokes aside, I recall hearing that humans are actually canonnically aliens and completely separate from Pokemon